We have an older Axxess system with 4 pots trunks and an EVMC. All calls go to a Hunt Group with a member list that has an extension list and then a CRA. When calls get to the CRA, intermittently we get "6 is an invalid selection" message. That digit is not in use. So far we have changed the LSC card, Rebuild the CRA, replaced the audio card on the EVMC, had a different person record the message that the callers hear. The trunks are plain old pots lines with no discernable static, popping, etc.. The only thing I can think if is to change the Hybrid balance at this point. Can anyone think of anything we have missed?